Question

chimie
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Answer 1

Răspuns:

-calculez masa de sare din solutia data

c=mdx100/ms----> md=c x ms/100= -20x400/100g= 80g

-calculez masa de precipitat si de soda, din ecuatia chimica, stiind M,CuSO4=160g/mol si M,Cu(OH)2= 98g/mol. M,NaOH=40g/mol

160g..............2x40g.............98g

CuSo4   + 2NaOH---->Cu(OH)2 + Na2SO4

80g.........................x................xy

x=40gNaOH=  ESTE masa dizolvata in slutie

y= 49gCu(OH)2

-calculez masa de solutie de soda

ms= mdx100/c=40x100/40g=100g

Explicație: